calculate a metal wire of length 1.2m and cross sectional 0.0000002 M square is stressed by a force of 50 N assuming the force constant of material or the wire is 6000 N/M. calculate the tensile stress, tensile strain, young modulus​

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.